Apparatus for grinding cultivator disks



A. J. HARTY 2,481,215

APPARATUS FOR GRINDING CULTIVATOR DISKS Filed July 8, 1946 4 Shee'ts S heet 1 Sept. 6, 1949. HARTY APPARATUS FOR GRINDING CULTIVATOR msxs 4 Sheets-Sheet 2 Filed July 8, 1946 S L W49. A. J. HARTY APPARATUS FOR GRINDING CULTIVATOR DISKS Filed July 8, 1946 4 Sheets-$heet 5 1949. A. J. HARTY 2,481,215

APPARATUS FOR GRINDING CULTIVATOR DISKS Filed July 8, 1946 Sheets-Sheet 4 Patented Sept. 6, 1949 UNITED STATES PATENT OFFICE 2,481,215 APPARATUS FOR GRINDING CULTIVATOR DISKS Andrew J. Harty, near Bradford, 111. Application July 8, 1946, Serial No. 681,895 17 Claims. (01. 51106) This invention pertains to machines for grinding and polishing harrow discs, while adapted for other grinding purposes.

An object of the invention is to provide a machine so arranged that a gang of discs removed from a cultivator-frame may be lifted bodily to a position at a grinding wheel where each disc of said gang may be sharpened.

Another object is to provide a machine with mechanism to engage a gang of mounted discs and station it in position for applying a grinding wheel or a polishing wheel to each disc separately, and to provide for automatically handling any such wheel for grinding or polishing.

Still another object is to provide a structure including a suspended grinding wheel which may be supported above and shifted in a direction paralleling a shaft upon which is mounted a series of discs as removed from a cultivator so that each separate disc so mounted may be ground and conditioned for further work in the field.

Again an object is to erect a carrying frame for supporting a driven grinding wheel that may be tilted on a horizontal axis above a series of shaftmounted cultivator-discs whereby said wheel can operate separately upon each of the several discs, the wheel at the same time being so suspended, also, that it may swing from the frame parallel to the series of discs so mounted.

Other objects and advantages will be apparent in the following description aided by the appended drawlngs forming part hereof, wherein Figure 1 is a plan of the machine of the present invention.

Figure 2 is a side elevation of a spanner bearing illustrated in said Figure 1.

Figure 2 is an elevation of part of a disc-shaft support in section showing a shaft with its disc supported thereon.

Figure 3 is a longitudinal section of a universal joint or chuck.

Figure 3 is a transverse section of said joint or chuck produced on line 3 of Figure 3.

Figure 4 is a side elevation of the machine as viewed from the left of Figure 1.

Figure 4 is a vertical section of a housing, and parts carried thereby.

Figure 5 is a front elevation of the same as viewed from the right of Figure 4.

Figures 5 and 5 are, respectively, a longitudinal section in elevation, and an end elevation of a locking structure shown in Figure 5.

Figure 6 is an enlarged view in part section of a hanger structure shown in Figure 5.

Figure '7 is an enlarged transverse section of a 2 member of a rocking frame shown in Figure 5 and a roller supported structure thereon.

Figure 8 is a sectional view in elevation of part of the wheeled supporting frame shown in Figure 4.

Figure 9 illustrates in perspective a structure illustrated in said Figure 8.

Figure 10 is a side elevation of operating parts as viewed from the right of Figure 5, and

Figures 11 and 12 are, respectively, a side elevation and a plan of a mechanism illustrated in plan in Figure 1.

As distinguished from the known art the machine of the present invention provides for lifting from the ground a disc-gang which has been removed from a disc harrow and placig it adjacent a grinding wheel where the latter by a special mounting can travel from end to end of the usual disc shaft so that all of the several discs thereon may be processed at one operation. That this may be done the shaft is coupled with a driving mechanism for rotation with respect to the driven grinding wheel, the latter being so mounted that it may be either manually applied to each disc at either side thereof, or automatically made to process the discs as will appear.

Again, while the machine is primarily adapted for disc grinding, or for polishing or bufiing, it is also so constructed that the grinding wheel may be adjusted for use as a bench tool for other grinding purposes, all of which will appear herein together with advantages of certain structures and. the operation thereof.

In the drawings I denotes a pair of spaced supporting sills upon which at what will be termed the front of the machine, is secured a rod or pipe 2 lying in a transverse position, while a rod or pipe 3 is likewise so placed near the rear ends of said sills as in Figures 1 and 4, the whole constituting a platform.

Erected upon the pipe 2 and secured thereto at each end is a standard 4, Figure 5, suitable braces 5 connecting said standards with the pipe 3, for example, whereby the standards are stabilized.

The upper ends of the standards 4 in this instance, have right angled extensions 6. Beneath the extensions is a rectangular frame I preferably long and narrow as in Figure 1, and serving as a runway for a carriage to be described, said frame at its narrow extremities being each supported midway thereof by hangers 8 enclosing said extremities of the standards.

In this manner said frame is free to rock or tilt vertically for a purpose to appear. Suspended within the frame I is a carriage 9 as a housing for an electric motor 1', said carriage having a stud lil extending from each .of two opposite sides, each stud being carried by and rockable in a pair of plates 12, said plates being mounted upon a pair of spaced tandem rollers H resting upon and to travel along one of the relatively long members of "the frameil. The plates i2 form a housing enclosing the frame members i to retain the rollers l I on the latter in the tilting or rocking movement of the carriage. Depending from the carriage 9 is a shaft 13, FigurexS, carrying a grinding wheel 14, said shaft being driven by the electric motor 1'. v

Mounted in fixed position upon the carriage 9 is a member ll parallel to the longest measurement of the frame I. This is provided with a series of holes I I for example, by which a weight ll may be secured by a pin H in any desired position. said -weight whrl -Shlfted in either direction along the mem ber l will tend to swing the grinding wheel in :one direction or the other during grinding oper'a'tions.

It is now evident that since the frame '1 is til able l'ater'ally,- and that the carriage 9 is tiltable on the said frame as permitted by the-studs 19 in the :plates 12 ,the grinding wheel is ree to swing in all directions.

As shown in Figure .5 a-.-frame l; is mounted on the rod or %pipe :2 at the front-of the structure. This frame, as in Figure l, is, in :this instance, of a U form, the extension-being mounted -to;ro ck upon said .pipe. These said extensions, as best shown in Figure 4, are-upturnedbeneath the position of the freely suspended, grinding wheel. The-extremities of the frame atthis position are recessed at 16, see Figure-z anda pair ofspaced rollers H lie therein in such positions as to receive upon them the shaft A of a gang'of discs,

one .of which is 'denoted-at Erin the figure last named. Further, forward -of .the recess 18 and said roller l-l each -of the frame gportions 315 has an upwardly-extendedforwardly curved finger 1 8. Also 1 mounted to swing about :and terminating at the pipe 2 is a secondframe-IQ, Figuresl, land 8. This frame is also .of a U-forn in this instance, and is thereforemuch like the frame it but lies within the latterand beneath the same at the rearthereo'fand attachedtheretoby bolts X, for example. Said frame 'has control of the frame so that when it 'is raised?to lthe'broken line position in Figure 4 the latter will also be raised to project outwardly the extremities ha ving the fingers l8. Said fingers in'the extended position willreceive'the'shaft 'A of the disc gang as the latter is rolledtowardthem,whereupon .by depressing the saidifrar'ries'fll and i9 thegang will be elevatedto p'osition'atsaid grinding wheel.

In order to support the separately extending extremities of the frame l'5"'in 'a'rigid manner a structure shown'inFigures 8 and!) i'sproVided merely as an'in'stance of'wh'at may beemploy'ed. That is to say, beneath'the frame 'i9'is arod'ZD lying across and secured"upon thesills I. Depending from said rod is avhanger 2i justfbe'l'ow each of the parallel extensions ;of said frame. Each hanger'is provided with'a slot'22. Within the slot lies a 'bar 23notched at 2 onits'lower edge near-one end 'to engage"the hanger'within saidslot' 22. The other end of thebar is pivoted at to the frame f9. AspiingZG 'constan'tlyunder a pulling tensionis'conne'ctedto and between-the bar 23 adjacentthe-pivbt' 2'5 and the hang'er 2i.

When the frames [Sand 19 l-ie'as in Figure 4' the notch 24 receives the edge of the slot 22 so that any tendency of the load of discs upon the frame [5 to swing forwardly and downwardly the upright extensions .of the latter will be thwarted.

When, however, the frames l5 and i9 are to be lifted to pick up the load from the ground (dotted lines Figure 4) a trip arrangement is employed. This may consist of a rock shaft 21 carried in the hanger and to which iisisecmie'dwa foot-lever 28. Said shaft is provided with a finger "29 at each of the two bars 23, Figures 1 and 9, so that by pressure on said foot-lever the two bars 23 will be disengaged from the hangers permitting the said frames l5 and 19 to be lifted. The springs 26 when greatly extended by raising the frames l5 and IQ 'will'assist in lifting the picked up load when the frames, l5 and I9 are again lowered.

In order to properly grind the discs of the supported gang some means of rotating the discs is required. Therefore, Jmounted in a bearing 36 fixed with respect to a 'sill see FFigurefi, "is a shaft *3 e centered with 'thesh'aft of the :disc-gang. This shaft is driven by arwh'eel 31' belted to the pulley SZ of a power unit 33. Saidshaft as shown in Figure 3 may have a squared socket 351 to receive a squared stub-shaftzi'ld which :extendszinto a tubular member 36 having zaisquare'd recess 35]. The stub-shaft has a ipin' 38 extending from -.each of its four sides, and these :extend.:through slots 39 in the walls of said member 13.6 while springs '46 encircle the pins between $5836.. walls and :said stub-shaft.

In the openlend of ithe @tubular member :33 may be inserted the end oftheishaftnifor'the adlSCS-IZB, said shaft at :its en'd :iusually' having a square portion 'l to which the irecess 3-1 iis:adap'ted.

By this, or anequivalent arrangementsitlis-clear that a positive drive for the shaftJl @is assured even though the axes- 'of the shafts; do mot =coincide.

Means is providediformaintainingengagement of the disc-shaft A with the itubularkmember 3'5. In Figures l, 4 and'51a-ts'tandard 42=is erected'on a sill I. Affixed 'to the Fstandard is a notched plate 43upon which is pivotedtaz lever fl-t carrying any'usual latch t5 foradiustmenhpurposes. Said lever carries arbller 132i, Figure :1, which maybe engaged with a disc near :itscenter ofurotation, the proper settingrof :the leverrserving ito:hold the shaft A of the'idiscsin permanent driven engagement with the tubul'arsmember 66.

It has long =been rconceded that the proper manner -of sharpening Ca-icultivator .disc .is to apply the grinding element to the convexside :of said disc and work towardlthebcuttingiedgezthereof. Ihe advantage-iofithe.presentistructure isat once realized. 'Thaitisatoasay; since the grinding wheel is so-mounted :as to be swung in=.al1;direc tions it can be used to provide therdescribed'preferred manner (if-sharpening. ;Further,-.the:wheel can be swung in contact with 'either [the convex or concave-sideof the disc without hindrance'and thereby tlie'whole di'sc 'can be cleane'ditov provide a bright surface-'as requir'ed 'for proper working in the field.

Since the 'carriage -ficarrying the-shaftzlfi of the grinding wheel I4 is free toswing as before stated, said wheel *may be employed in grinding for purposes other than'di-scZtreatment. As will be noted I in -Figure 5 in 'broken lines"-the grinding wheel 15 may be swung with: said carriage '9: =so that the said grinding wheel l 41'may rotate inea vertical plane. In order 'that the shaft 13 1 may retain a substantially horlzontal-position,:in this instance, a sliding' bearing ifi' -is provided-denoted in continuous lines in Figures 1 and 4, see also Figure 2. This may include a pair of U-bolts 45 to engage beneath the side rails or members of the lifting frame 1 which may be removed or placed in position as occasion demands. In Figure 5 this bearing 45', which is slidably mounted upon the long rails of the frame I, is removed from the continuous line position and replaced at the broken line position to support the said shaft l3. In order that the grinding wheel 14 may be conveniently used as a bench tool the entire machine may be tilted forwardly as shown in broken lines in Figure 4, the carriage 9 and the wheel being placed in a convenient position for use. At such time the disc-supporting extension of the frame 15 being out of the way since said frame, rearwardly, may lie close to the sills I as in continuous lines in the drawing-figure last named. Means are provided for fixing the mountings of the carriage in respect to the rails of the said frame whenever required for a stationary grinding position. This means, of which there are two, shown in Figures 1, 5, 5 and 5 may each consist of a housing 46 .of U-form, for example, each of which is normally slidable upon a rail. Between the extensions of each housing is a friction block 41 spaced from which is an arm 48 pivoted at one end to said. housing. Abutting the under side of the free end of the arm is a rocking arm 49 extending from a shaft 50 extending between and journaled in both housings 45. Finally, a compression spring 50 is interposed between the arm 48 and the named friction block.

It may be thus seen that by rotating the shaft 50 each of the two blocks may be made to either grip a rail of the frame I .or release it. The two housings 46' are connected with the mountings 12 for the carriage 9 by links 5| pivotally connected to each. When the rails are thus gripped the carriage 9 is prevented from shifting along the rails when it is desired to manually swing said carriage on its studs ID at a fixed point. In this connection it is to be noted in Figures 4 and 5 that a stabilizing frame 9 for the grinding wheel shaft I3 is secured to the carriage and from the extremity of said frame extends horizontally a rod 9 Figures 1 and 4 having a cross arm 9 which latter, when gripped by the operator, serves to swing the grinding wheel to any position desired.

It has been heretofore intimated that the operation .of grinding the discs B may be either manual or automatic. Mechanism is now made known for the latter method. The previously described shaft 30 driven by motor 33 is provided with a pulley 30 belted to a wheel 5|, Figures 1 and 10. Said wheel is affixed to a shaft 52 having, a bearing in a plate 53 secured in this instance to an upright member 4 of the mechanism. Said shaft 52 carries a plate 54 provided with a stud 55 spaced from the center of plate rotation, the plate 50 and stud serving as a crank, as will be seen. Carried by said stud 55 is a frame including in this instance a pair of parallel arms 58 forming a U. Affixed to and spanning the space between the arms is a portion 51 through which extends a thread bar 58, the latter extending from the closed end of the U-member 56 and provided. with a crank 59. The thread bar rotates within the portion 51 without results and is prevented from traveling therein by collars 60 fixed to said thread bar. The free end of the thread bar has. engagement, however, with an arm 6 I, the latter, therefore, in the rotation of the thread bar increasing or decreasing the distance between itseli and the stud 55for a purpose to appear, it being understood that since the thread bar 58 may rotate within theportion 51 it has 'endwise move ment in the arm 6|, thus changing the distance between said portion 57 and the said arm Bl with which'ithasthreaded engagement. 1

Secured: to and depending'from the frame 1, Figures 1, Land 10 is a rod 62 having a crosspin 63 therein which projects from opposite sides thereof as best'shown in Figure 12. The arm 6| carries on-its underside a saddle member 64 adapted to receive one extremity .of said pin 63 into it, a.

weight 55 on the-arm normally preserving their engagement. 1

Mounted to tilt on the opposite end of the pin 53 is a hand lever 66 one end of which carries a pin 61 to engage beneath the arm 6| as in Figure 12. A'compression spring 68. on the pin 63 between the depending rod 62 and the lever 66 serves, by friction, to hold the saddle member 64 above and free of the pin 63 when the said arm 6| islifted. Y

When the motor 33 operation the belt wheel 5| is always in operation together with a reciprocating motion imparted to the arm 6|. During such reciprocations of the latter no action is imparted; However, during such movements the depending. rod 62 will be swung in opposite direction when the saddle member 64 is restingupon the pin63. In this event the frame 1 will be tilted in opposite direction as the stud 55 of the plate 54. movesthrough its orbit. Naturally, cessation of thissmovement results when the hand lever 66 isoperated to lift said arm 6|. The degreeof swing of the depending rod 62 is governed by the adjustment of the thread bar 58 as explained earlier.

The purpose of swinging or tilting the frame 1 is that when such as a wire brush is substituted for a grinding wheel the entire opposite surfaces of each disc B may be traversed by the brush as suspendedrfrom said frame 1. The adjustment at the thread bar 58 is such that discs of various diameters may be processed.

During the removal of rust from the disc, and the somewhat polishing action on the same the automatic action is assisted by shifting the weight H of the carriage to such a position that the brush will be forced in the direction of the surface being treated.

By theslow rate of rotation of the crank pin 55 due to the difierence in size of the pulleys 323l) as compared with the size of the wheels 3l5l' the tilting action of the frame 1 is quite slow sothatthe swinging movement of the rapidly rotating wire brush over the disc surfaces is quite slow, while at the same time the rate of rotation of the discs is also slow.

In Figures 4. and 5, particularly, an arrangement is shown which will either secure the frame 1 with respect toa standard 4, or permit the 'tilt-.

ing actionjust described, depending upon whether the operator desires a fixed condition during manual handling of the grinding wheel, or automatic action when employing the wire brush.

A structure not unlike that described in respect to what is shown in Figures 11 and 12 is employed for the above purpose. In this case the U-shaped structure denoted at 56. corresponding to the structure 56 is attached at one end to the frame I by a link: 69-,while at its other end it is attached by a'link. 10 to a leverv ll pivoted to a notched member ,12 securedon the standard 4, said lever having. any usual latch 13 to engage said notched member, r

When .the latch .is engaged: with a notched member "12 tilting. of the; framev 1-. is. prevented but-when disengaged the frame free" to tilt. In: the. latter -case..a link-l4. onthe lever serves toi enga e Hover; the latch arrangement .tohold 5 it in disengagedpositiom .lnrthis' latterposition of thelatch. the frame 1- in tilitingwill: merely swing; the leverjH vertically afreeifashion: Throughout the foregoingacertain structures havebeen described for useb.ut;naturallyi-eq1iiv;

lifted: together-with: the frame-l5 and thus the fingers t8 of the'latterare swung downwardly and forwardly to a position to receive'tthe shaft AQ-Of the-idiscsasin broken lines-inFigure 4 'Then bymovingj the framesto their original positions shownjn saidrfigure'theforward extremities of said frame-.- l.5.1will take the-upright position, carry ing-1 the. disc-gang with .them; said' shaft A naturally dropping by gravity uponath'esupporteingrollers .t'l therefon.

a At thistime; the said rods .23 againengagethe hangers; 21 thus supporting the disc-shaftin working position As this occurs the-named shaftr has beenpresented to. the universal :joint or chuck 3,6; whereupon. thelever marrying? the wheel 4.6,;Figure' 1',.- is: shifted in a direction to-rforcezsaid- 5'.

wheel 46 against} an adjacent disc-B and throughsaid disc shift the shaft into saidec-hucle indriving relationtherewith. Starting the motor 133, ofy-course, will set the discs-in-rotation; Upon starting-of'the motor'l within-the carriageafl' the 40 rindingfwheelior brush, aswcasez'n'i'av be,'-.is. set: in rotation andbymeans. of thecontrol structure 9 .93 thewh'eel may: beurged againstany-desired disc, this being possibled-ue to the freelyr'swing ing carriage, and the; ability toshi-ft the latter along theframev l. Andes-an -aid;to the operator infswinging-"the carriage in-a given. direction-the weight. ll onisaidcarriage may" be shifted to that position onythebar Ii thatawil-l-mostrhelp.v

such operator in any tilt given said icarriage.

During these operations ofhand grinding the frame! maybe-allowed tortiltfon the standards; 4-, or prevented from doing so by employing the mechanism 56 'i l-,- .12- at the right; ofaEigur e- 42' 'If, now, the machine is to' operate in-anfautm' matic manner the parts shownin -'Figures .10', 11' and 1 l2 may be: employed-. As alread y: stated, the belted mechanism in Figure- 10 is always-r in opi oration-when thezmotor 33 iscin. action. If the arm' fil I is not operatively. engaged :with the; pin 60' 631 onthe'rod'62 of Figure ll it may b'e allowedato: lower-.by moving the lever- 66." This 'adonepthe part- 60: which :is always in motion en'dwiseadue to the-travel of the crank-pin 55 of the=rotati ngiplate 54, Will -transmit a slowrockingmovement tothe frame I E by. reason. of theswing;- of': the said rod- GE-imparted by said 'arm fil. ln 'suchtevent, of course the:said rocking mechanism. '56 .11; T2? is "permitted free movement withthe said'i-fra me l by latchingthelink l lof that mechanism 'upon the-=then disengaged-latch 1'3: Since -th'e frame is 'nowrockable the 'carriage il will rocle with it and therefore the abrading wheell which in" this instance may be a-=wi1'e 'brus'h,=-oar i be pl'aced" against any disc surface to clean that surface of rust. Any disc will be traversedfrom periphery to near its center as the brush: thus swings:with said frame. At this time the. carriage 9 may be so located on the frameithat-its weightwill hold the brush to its work aided by the adjusted weight Hithe entire series of discs being thusworked upon.

If discs of difierent gangszare of various diameters it is clear that the adjustment of the thread bar 53. of Figure 11' will serve to increase or decrease the distance of brush travel'in accordance with disc diameter.

When the abrading wheel I4 is to be used as at a bench, for example,-by rotating in a vertical plane, see broken lines in Figure5, the entire machine may be tilted forwardly as in Figure" 4 (broken lines) thus carrying the carriage clear of the machine for close-up work of the oper ator, and by shifting the bearing 45 along the frame! to the broken line position to support the shaftlS the mechanism is in condition for various grinding operations. When so used the parts 9 9 may be removed from-the carriage to be out of the way of such operator.

I claim:

1. In apparatus of the type described,=a supporting frame, a'suspended' rotatable" abrading wheel carried by the frame, means supported'on the frame adapted to swingin a vertical pla'ne downwardly to a position toreceive upon it the shaft of :a cultivator disc gang, said means adapted'formoving the received disc-gang to a position adjacent said wheel for receiving abrad'- ing action of thesame upona disc of said gang.

2. In apparatus ofthe' type described, a supporting'frame, a suspended rotatable abrading wheel carried by'the frame, means supported on theframe adapted to swing in a'v'ertical plane downwardly to a position to receive upon it the shaft of a cultivator disc-gang, said means adapted for moving'the received disc-gang to' a position adjacent said wheel for receiving abrad ing-action of 'the same upon a'disc of said'ga'n'g, and-means for positively maintaining the'first said means in a position durin the action of said wheel upon said disc.

3. In apparatus of the type described, a supporting frame, a suspended rotatable abrading wheel-carried bythe frame and capable of swinging movement in all directions, means supportedon the frame adaptedto swing in asubsta-ntially vertical plane between two extreme positions and in one of its positions adapted torecei've thereon a'culti'vator disc-gang andin another positionadapted to hold the-disc-gang in a position to receive therotating abrading wheel'upon'the disc surfaces.

4.- In apparatus of the type described, a supporting frame, a suspended'rotatable abrading wheel carried by the frame and capable of swinging movement in all directions, meanssupported on the frame adapted to swin in a substantially vertical plane between two extreme" positions and in one of its positions adapted to hold the disc-gang in a position to receive the rotating abrading wheelupon the disc surfaces, andporting frame, a suspended rotatable abrading wheel carried by the frame and capable-of swinging movement in .all directions; means supported-- on the frame adapted to" swing in asubstantially vertical plane betweentwo extreme positions and-in one ofits positions adapted to hold-the- 9 disc-gang in a position to receive the rotating abrading wheel upon the disc surfaces, means to rotate the disc-gang -when the same is in the second named position, and means for positively isustaining said means in the last named posifirInapparatus for the purpose described, a framing, means mounted on the framing swing? able in a substantially vertical plane-from a substantially horizontal position to a substantially upright position and adapted to carry a cultivator disc shaft having a seri'es of discs thereon, means engageable with and adapted to rotate said shaft, a support carried by the framing, and a driven rotatable abrading wheelsuspended from and adapted to move along said support substantially parallel to said shaft in close relation to the named discs. T

7. In apparatus for the purpose described, a framing, means mounteclon the'framing swingable in a substantially vertical plane from a substantially horizontal position to a substantially upright position and adapted to carry a cultivator disc shaft havin a series of discs thereon, means engageable with and adapted to rotate said shaft, a support carried by the framing, and a driven rotatable abrading wheel suspended from and adapted to move along said support substantially parallel to said shaft in close relation to the named discs, and means to fix the first named means in its upright position.

8. In apparatus for the purpose described, a framing, means mounted on the framing adapted to swing between two extreme positions in a substantially vertical plane, said means in an extended position adapted to receive thereon the shaft of a cultivator disc-gang and adapted also when moved to another position to lift said discgang and to support it in a freely rotatable position, means to engage and rotate said shaft of said disc-gang in its lifted position, a support carried by the framing, and a rotatable abrading wheel depending from the support arranged to shift in a plane substantially paralleling said shaft of said gang.

9. In apparatus of the character described, a framing, a tiltable structure supported on the framing constituting a runway for a carriage, a carriage mounted on the structure adapted to shift along the same, a mounted and driven abrading wheel depending from the carriage, mechanism connected with and for automatically tilting the structure, and a support for carrying the shaft of a cultivator disc-gang, said shaft substantially paralleling the direction of shift of said carriage on said structure.

10. In apparatus of the character described, a framing, a tiltable structure supported on the framing constituting a runway for a carriage, a carriage mounted on the structure adapted to shift along the same, a mounted and driven abrading wheel depending from the carriage, mechanism connected with and for automatically tilting the structure, a support for carrying the shaft of a cultivator disc-gang, said shaft substantially paralleling the direction of shift of said carriage on said structure, and driving mechanism adapted to receive said shaft for rotating the same.

11. In apparatus of the character described, a framing, a tiltable structure supported on the framing constituting a runway for a carriage, a carriage mounted on the structure shiftable therealong, a mounted driven abrading wheel depending from the carriage, a support for carry- 10 ing the shaft of a cultivator disc-gang, said shaft substantially parallelin'g'the direction of shift of said carriage, and power means totilt the tiltable structure and to rotate the named shaft.

12. In apparatus of the character described, a framing, a tiltablestructure supported on the framing constituting'afyrunway for a carriage, a carriage mounted onthe structure shiftable therealong} amounted driven abrading wheel depending from the carriage; a support for carrying the shaft of a cultivator disc-gang, said shaft substantiallyfparalleling the direction of shift of said carriage, power means to tilt the tiltable structure andto rotate the named shaft, and means to terminate'the driving connection of the power means" with the said tiltable structure to halt the 'same'i 13. In apparatus of the character described, a framing, a structure pivotally mounted on the framing adapted ;to'*be tilted in opposite directions, power meaesror tilting sai dstructure, a support for supporting the rotatable shaft of a cultivator disc-gang thereon connected to said power means, a carriage carried by and shiftable along the tiltable structure, a rotatable abrading wheel supported on and depending from the carriage in position to act upon any one of the discs of said disc-gang, and means to fix the named tiltable structure with respect to said framing.

14. In apparatus of the character described, a framing, a structure pivotally mounted on the framing adapted to be tilted in opposite directions in a substantially vertical plane, power means for tilting said structure, a carriage shiftable along the structure in a direction at right angles to the tilting movement of the same and itself tiltable with respect thereto, an abrading wheel and a driving shaft therefor carried by and depending from the carriage, a support for the shaft of a cultivator disc-gang having a series of discs thereon, power means to tilt the said structure and to rotate said shaft, the said wheel having a position by which to operate upon any one of said discs, and means mounted on the said carriage and adjustable thereon in the direction of tilting of the latter with respect to the tiltable structure on which it is mounted whereby the said abrading wheel is held by pressure against the surface of a disc being processed.

15. In apparatus for the purpose described, a framing, a substantially horizontal structure mounted on said framing constituting a carriage supported by and shiftable along the same, a rotatable abrading wheel and its shaft extending from said carriage to normally depend therefrom, and said carriage being mounted to swing with respect to said structure and capable of being swung to a position in which said abrading wheel will rotate in a substantially vertical plane, and a member mounted on the said structure to serve as a bearing for the named shaft of the wheel when the latter rotates in said plane, said member normally having a position on said structure free of and distant from said shaft.

16. In apparatus for the purpose described, a platform, a structure mounted upon the same to support the shaft of a cultivator disc-gang, a supporting structure mounted on the platform, a frame pivotally mounted on the said structure constituting a runway capable of tilting with respect thereto in a plane paralleling the planes of the discs of the said disc gang, a source of power shiftable along the runway in a line paralleling the said shaft of the disc-gang, an abrading wheel driven by said power source, driven -9 6r or 9 eluding in itspon 15 6t p atfonp; a gm;-

mfilly' ht" a fi ls: tri l qtli l ri v a mounted at i s 1 9? 9 n w iz ei q a a w t fit Q I q i .9 e me 99* in ng 93. .99%? i 9 391991 p an s d e rq e W s fl w wrl e em t6 feceive intp giig1 es 1 1a ,oi a disc gang, a ,9999 4299919199??? 911. a qr a m iv t'a 'y HHP 19 t e .f ami d q' F9 91 i i 191% m a le s he d ction of swing of said supgg iggsjlrgeture, a, r a able 99. 195995- whee aei s 919% a .sa fla to rryi ew-n l 9.99512 5 "Ki 9 1 id r m in 9.. i '.f&P I 99 1995195 $9 meg m difctioh o win 91%? named supfi ms Strum We ai hee adafv e 'wnem at in its nbrmal upright position 119 traverse the surfaces or vany disc of said disc gang, M

ANDREW J. HARW.

REFERENCES CITED The following references alre of record in the file of this patent:

UNITED STATES PATENTS 

